System of electrical distribution.



No. 832,857. PATENTED OCT. 2, 1906. E. J. BERG.

SYSTEM OF ELECTRICAL DISTRIBUTION.

APPLIGATION FILED APB-25.1900.

Witnesses I I I I Jnventor? 491 EmsbJBerg,

m N MM- M w PATENT OFFICE.

UNITED. sTArEs ERNST J. BERG, OF SCHENEUTADY, NEWV YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

SYSTEM OF ELECTRICAL DISTRIBUTION.

Specification of Letters Patent.

Patented Oct. 2, 1906.

Application filed April 25; 1900. Serial No. 14,215.

To all whmn it may concern:

Be it known that I, EnNs'r J. BERG, a citizenof the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Systems of Electrical Distribution, of which the following is a specification.

My present invention relates to a system of electrical distribution and comprises certain means for regulating the voltage of supply-mains in response to variations of load. The specific means which I employ for this purpose consists of a dynamo-electric machine or booster with its armature in series with the'circuit to be regulated and driven at it'sgeed variable in response to variation of My invention will best be understood by reference to the following description, taken n connection withthe accompanying drawmg, while its scope will be particularly pointed-out in the claims appended hereto.

The drawing represents a distributing system in which alternating current is first conyerted into direct current and then utilized in a consumption-circuit.

At I have indicated a three-phase stepdown transformer supplied with energy over transmission-lines 2 3 4 and with itsscondary connected, through leads 5 6 7, to a rotary converter, (indicated at 8.) The directcurrent terminals of the rotary converter are connected to mains 9 10, by which direct current ls'supplied to a consumption-circuit, here represented in part by the storage battery 11 It is to be understood, however, that the .current may be supplied to any other suitable translating devices.

To secure the desired regulation, I make use of two mechanically-connected dynamo.- electric machines, one of which operates as a booster and the other as a motor. This boosteror regulating-generator I prefer to refer to hereinafter by the term generator rather than booster, for the reason that it may be so connected either to add its voltage to that of the system or to oppose the voltage. The generator is indicated at 12 and is connected with its armature 13 in series with the main 9, leading to the translating device. ltsfield winding 15 is connected in .shunt across the direct-current mains 9 10. The generator 12 is connected through a shaft 14 with the armature 16 of a differentially-wound motor.- This motor has its armature-circuit connected directly across the mains 9 10 at points indicated by the numerals .17 18 and is provided with two field-windings acting in opposition to each other, one of these windings bein connected in series with the main 9 and t e other in shunt across the mains 9 10. The shuntwinding is indicated in the drawing at 19 and the series winding at 20. Upon increase in load on the direct-current system the current through the series windin 20 of the driving-motor increases, there y. cutting down the resultant field strength of the motor, which thereupon speeds up. The armature electromotive force of the generator 12 driven thereby therefore increases correspondingly, and since the armature is in serice with the direct-current circuit the electromotive force roduced by the enerator 12 is either added to or subtracted om that impressed upon themains, depending on the manner in which the armature is connected in'circuit. It will be obvious to one skilled in the art that by proper adjustment the electromotive force impressed on themains may be such as to secure an overcompounding eflect or to maintain a constant potential at the terminals of the machine, or instead of causing the electromotive force of the enerator -12 to be added to the linethe mac inc may be s'o-connected in as to reduce the voltage upon increase of load. In such a case the storage battery 11 assists in supplying current when the load is heavy and is charged at light loads. Either mode of connecting in the generator 12 is within the terms of my invention.

What I claim as new, and desire to secure by Letters Patent of the United States, is 1. The combination of a source of current, mains extending therefrom, current-consuming apparatus supplied with current from said mains, a generator having its armature in series with one of said mains so that its voltage is combined with that impressed upon the mains, and a motor mechanically coupled to said generator, said motor having a field-winding in shunt to said mains and another field-winding in series with one of said mains. f

2. The combination of mains, a source of current-supply therefor, a generator with its armature in series with one of said mains, a

v motor rnechanicall connected to said generator, and means or "automatically varying the speed of said r'notor in response to varia tron-of load on said mains 3; The combination of direct current mains, anelectromotive-force generator connected in series with one of said mains and acting in opposition to currentflowing in said main, and means for driving said generator at a variable speed.

, '4.. The combination of direct current mains, an eleGtromotive-force generator connected -1nser1es with one of saidmeans and acting- 1n opposition to current flowing in said main and means for driving said generator at a speedvarying automatically with the load.

5. -The combination of direct current mains, a storage battery connected'thereto, an eiectro'rnotive-force generator connected 20 in opposition in one of said mains, and means for automatically'varying the speed of said generator .with variation of load.

In witness whereof I have hereunto set my handthis 23d day of April, 1900.

ERNST, J. BERG.

I Witnesses:

' BENJAMIN B. HULL,

ALEX F. MACDONALD. 

